add batch download api (#436)

* Add POST /downloads endpoint for creating multiple

* Fix review notes

* Add chapter id to API endpoints

* Rewrite batch chapter download to use chapter id instead of mangaId+chapterIndex combination

* Change EnqueueInput format to be more futureproof

* Change endpoint path

* Change endpoint path

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/Chapter.kt

@@ -140,6 +140,7 @@ object Chapter {
             val dbChapter = dbChapterMap.getValue(it.url)
 
             ChapterDataClass(
+                dbChapter[ChapterTable.id].value,
                 it.url,
                 it.name,
                 it.date_upload,